One-step forming die for U-shaped large arc

Abstract

The utility model discloses a one-step forming die for a U-shaped large arc. The one-step forming die comprises an upper die and a lower die, the lower surface of the upper die is provided with a large arc punch and two bending punches symmetrically arranged on the left side and the right side of the large arc punch, and the lower ends of the opposite faces of the two bending punches are detachably connected with wedge blocks. The upper surface of the lower die is provided with two bilaterally symmetrical push blocks, the upper ends of the opposite surfaces of the two push blocks are provided with arc-shaped grooves, and when the two push blocks are close to each other, the two arc-shaped grooves jointly define a semicircular groove; the opposite faces of the two push blocks are each connected with a reset spring, and the upper ends of the opposite faces of the two push blocks are each matched with a wedge-shaped block through a wedge-shaped face. When the upper die moves downwards, the large arc punch pushes the plate-shaped product to enter the semicircular groove, and the two wedge-shaped blocks push the two push blocks to get close to each other so as to form a U-shaped product. The U-shaped product can be formed at a time by adopting one set of die, the machining cost and the equipment cost are reduced, and the machining efficiency is also improved.

Description

Technical Field

[0001] This utility model relates to the field of sheet metal processing, specifically to a U-shaped large arc one-time forming mold. Background Technology

[0002] In the field of sheet metal processing, forming U-shaped structures is a common but complex task. Currently, the industry typically uses a two-bending process to process U-shaped sheet metal: first, the middle of the straight sheet is bent into a large arc to form the bottom of the U; then, the straight sections at both ends of the sheet are pushed inward to 90° using a side-pushing die to complete the sidewall formation of the U. However, this traditional processing method has many limitations in practical applications, mainly in the following aspects:

[0003] High cost: Because two independent molds are required to complete the middle bending and side wall forming respectively, the manufacturing, maintenance and replacement costs of the molds are high, which increases the production investment of enterprises.

[0004] Inefficient: The two bending processes require separate steps and cannot be formed in one go, resulting in a complex and time-consuming processing flow that is difficult to meet the needs of large-scale production.

[0005] Insufficient precision: For metal sheets with a certain degree of elasticity (such as some aluminum alloys or high-strength steel), after the side-pushing die bends both ends of the sheet to 90°, due to the material's inherent elasticity and the influence of the large arc structure in the middle, the bent portion is prone to springback. This results in the actual angle of the straight sections at both ends being less than 90°, failing to meet product design requirements. In such cases, additional adjustments or secondary processing are often required, further increasing process costs and reducing production efficiency.

[0006] Furthermore, as market demands for precision and efficiency in sheet metal processing continue to rise, the limitations of traditional double-bending processes are becoming increasingly apparent. Particularly in industries such as automotive, aerospace, and home appliances, the application of U-shaped sheet metal is becoming increasingly widespread, making the need for low-cost, high-efficiency, and high-precision processing technologies more urgent. Therefore, optimizing existing processes and developing a U-shaped sheet metal forming method that balances cost, efficiency, and precision has become a critical issue that the industry urgently needs to address.

[0007] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0008] The purpose of this invention is to provide a U-shaped large arc one-time forming mold.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0010] A U-shaped large arc one-time forming mold is used to form a plate-shaped product into a U-shaped product, the mold including an upper mold and a lower mold;

[0011] The lower surface of the upper die has a large arc punch and two bent punches symmetrically arranged on the left and right sides of the large arc punch. The lower ends of the opposite surfaces of the two bent punches are detachably connected to wedge blocks.

[0012] The upper surface of the lower mold has two symmetrical push blocks. The upper end of the opposite surface of the two push blocks is provided with an arc groove. When the two push blocks are close together, the two arc grooves together define a semi-circular groove. A reset spring is connected to the opposite back of the two push blocks, and the upper end of the opposite back of the two push blocks is engaged with a wedge block through a wedge surface.

[0013] As the upper die moves downward, the large arc punch pushes the plate-shaped product into the semi-circular groove, and the two wedge blocks push the two push blocks closer to each other to form the U-shaped product.

[0014] Preferably, the two arc-shaped grooves extend vertically upward from the upper ends of their respective groove walls and gradually slope inward to form an inclined abutment; the upper end of the head side wall of the large arc punch is provided with an inclined support part that cooperates with the inclined abutment.

[0015] The large arc punch matches the semi-circular groove, so that when the plate-shaped product is bent to fit with the semi-circular groove, the straight parts at both ends of the U-shaped product tilt inward and spring back to a 90° vertical state after disengaging from the semi-circular groove.

[0016] More preferably, the angles at which the inclined abutment portion and the straight portion are inclined inward are the same and both are less than 10°.

[0017] More preferably, the inclined abutment portion and the straight portion are inclined inward at the same angle, both being 3°.

[0018] More preferably, the upper end of the inclined abutment portion is rounded.

[0019] Preferably, the upper mold includes an upper mold base, an upper pad, an upper clamping plate, and a stop plate arranged sequentially from top to bottom;

[0020] The upper pad and the upper mold base are detachably connected, and the upper clamping plate and the stop plate are detachably connected and the two slide up and down with the upper mold base through a nitrogen spring;

[0021] The upper edge of the large arc punch is connected to a stripper, which is detachably connected to the stop plate by a headless screw.

[0022] The bending punch is detachably connected to the upper pad by screws.

[0023] More preferably, each of the bending punches is provided with bending blocks on both sides, and the bending blocks are detachably connected to the upper pad by screws.

[0024] Preferably, the lower mold includes a lower mold base, a lower pad, and a lower clamping plate arranged sequentially from bottom to top. The lower pad is detachably connected to the lower mold base, and the lower clamping plate is detachably connected to the lower pad. The two push blocks are slidably disposed on the upper surface of the lower clamping plate.

[0025] More preferably, the upper surface of the lower clamping plate is provided with two lower stops and two side stops. The two lower stops are located below the two bending punches, and the two side stops are located outside the two bending punches. When the mold is closed, the inner sidewall of the side stops is in contact with the outer sidewall of the bending punch.

[0026] Preferably, a reset spring is connected to the opposite surface of each of the two push blocks, so that when the two push blocks are pushed close to each other by a pushing force, the two reset springs store force, and when the two push blocks are not pushed by a pushing force, the two reset springs push the two push blocks to reset.

[0027] In a further preferred embodiment, a bolt is sleeved on the outside of the return spring, the bolt passing through the side stop block, the return spring being sleeved on the outside of the bolt, and both ends of the return spring abutting against the head of the bolt and the side stop block, respectively.

[0028] More preferably, a waist-shaped hole is provided through the upper and lower surfaces of the two push blocks, the length direction of the waist-shaped hole is the moving direction of the push block, a positioning rod for positioning the plate-shaped product is provided in the waist-shaped hole, a T-shaped hole is provided on the lower clamping plate, the upper end of the T-shaped hole is engaged with the positioning rod, and the lower end has a fastening screw, the fastening screw is threaded to the lower end of the positioning rod and the head of the fastening screw abuts against the lower surface of the lower clamping plate.

[0029] More preferably, a float is provided between the two push blocks. The upper end face of the float corresponds to and matches the middle of the lower surface of the U-shaped product. The lower clamping plate and the lower pad corresponding to the lower end of the float are provided with through holes. The float is driven to move upward in the through holes to push the U-shaped product above the semi-circular groove.

[0030] More preferably, the float is configured as an inverted T-shape, with its lower end slidingly engaged with the through hole, and its upper end located between the two push blocks and moving in and out of the semi-circular groove under the drive.

[0031] More preferably, the drive includes a push rod, which is driven by a cylinder to push the float upward.

[0032] The working principle and advantages of this utility model are as follows:

[0033] This invention divides the semi-circular groove of the formed product into two parts. When the large arc punch moves down, the wedge-shaped block at the lower end of the bending punch and the two push blocks on the lower die cooperate through the wedge-shaped surface, so that the two push blocks move closer to each other. When the large arc punch moves down to the position, the arc groove between the two push blocks merges into a semi-circular groove. This allows for the one-time forming of U-shaped products using a single mold. The entire mold structure is ingeniously designed, resulting in a high one-time forming rate, reducing processing and equipment costs, and improving processing efficiency.

[0034] The upper ends of the two sides of the semi-circular groove of this utility model are inclined inward and rounded, which allows the two straight parts of the product to bend inward. After the product is demolded, the straight parts spring back to a 90° vertical state. The product does not need to be bent and repaired twice, which reduces processing costs and improves production efficiency.

[0035] This invention utilizes the wedge-shaped surface to link the horizontal movement of the two push blocks when the upper die moves downward. This not only enables the one-time formation of U-shaped products, but also achieves interference-free docking and clamping of the large arc punch and the semi-circular groove with the upper end retracting inward. This overcomes the technical obstacle that the large arc punch cannot enter the fixed semi-circular groove due to the upper end retracting inward in the semi-circular groove, thus realizing one-time forming of U-shaped products with the upper end retracting inward. Attached Figure Description

[0036] Appendix Figure 1 This is a side view of the mold-opening state according to an embodiment of the present invention;

[0037] Appendix Figure 2 This is a side view of the mold-closed state according to an embodiment of the present invention;

[0038] Appendix Figure 3 For the present invention Figure 2 Enlarged view of the structure when the straight section of part A is bent into an inward tilted state;

[0039] Appendix Figure 4 This is an enlarged view of the structure of the straight section of the present invention when it springs back to a vertical state;

[0040] Appendix Figure 5 For the present invention Figure 2 Enlarged view of the structure of section B;

[0041] Appendix Figure 6 For the present invention Figure 1 Enlarged view of the structure of section C;

[0042] Appendix Figure 7 This is a bottom view of the upper mold in an embodiment of the present invention;

[0043] Appendix Figure 8 This is a front view of the upper mold in an embodiment of the present invention;

[0044] Appendix Figure 9This is a top view of the lower mold according to an embodiment of the present invention;

[0045] Appendix Figure 10 This is a front view of the lower mold according to an embodiment of the present invention;

[0046] Appendix Figure 11 For the present invention Figure 9 Enlarged view of the structure of section D in the middle.

[0047] In the attached diagrams: 100 Upper mold; 101 Upper mold base; 102 Upper backing plate; 103 Upper clamping plate; 104 Stop plate; 105 Stripper insert; 106 Nitrogen spring;

[0048] 200 Lower mold; 201 Lower mold base; 202 Lower backing plate; 203 Lower clamping plate;

[0049] 300 sheet-like products;

[0050] 400U type product;

[0051] 1. Large arc punch; 2. Bending punch; 3. Wedge block; 31. Second wedge surface; 4. Push block; 41. Arc groove; 42. First wedge surface; 43. Waist-shaped hole; 44. Inclined abutment part; 5. Return spring; 6. Bending stop block; 7. Lower stop block; 8. Side stop block; 9. Bolt; 10. Float block; 11. Top rod; 12. Positioning rod; 13. T-hole; 14. Fastening screw; 15. Inclined support part. Detailed Implementation

[0052] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0053] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0054] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0055] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0056] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0057] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0058] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0059] See appendix Figures 1-11 As shown, a U-shaped large arc one-time forming mold is used to form a plate-shaped product 300 into a U-shaped product 400.

[0060] The mold includes an upper mold 100 and a lower mold 200.

[0061] The lower surface of the upper die 100 has a large arc punch 1 and two bent punches 2 symmetrically arranged on the left and right sides of the large arc punch 1. The lower ends of the opposite surfaces of the two bent punches 2 are detachably connected to wedge blocks 3.

[0062] The upper surface of the lower mold 200 has two symmetrical push blocks 4. The upper ends of the opposite surfaces of the two push blocks 4 are provided with arc-shaped grooves 41. When the two push blocks 4 are close together, the two arc-shaped grooves 41 together define a semi-circular groove. The first wedge-shaped surface 42 at the upper end of the opposite surfaces of the two push blocks 4 cooperates with the second wedge-shaped surface 31 on the inner side of the lower end of the wedge block 3. When the upper mold 100 moves down, the large arc punch 1 pushes the plate-shaped product 300 into the space between the two arc-shaped grooves 41, and the two wedge blocks 3 push the two push blocks 4 closer to each other. The two arc-shaped grooves 41 merge into a semi-circular groove, and the two arc-shaped grooves 41 laterally bend the plate-shaped product 300 to form the U-shaped product 400.

[0063] In this embodiment, the two arc-shaped grooves 41 extend vertically upward relative to the upper ends of the groove walls and gradually incline inward to form an inclined abutment portion 44. The upper end of the head side wall of the large arc punch 1 is provided with an inclined support portion 15 that cooperates with the inclined abutment portion 44, so that the large arc punch 1 matches the two arc-shaped grooves 41. When the plate-shaped product 300 is bent to fit against the two arc-shaped grooves 41, the straight portions at both ends of the U-shaped product 400 incline inward and spring back to a 90° vertical state after disengaging from the arc-shaped grooves 41. The inward inclination angle of the inclined abutment portion 44 and the straight portions is the same and less than 10°. For products with different springback coefficients, this inclination angle can be adjusted, as long as the straight portions at both ends of the bent product can spring back to a 90° vertical state. For general sheet metal products, the two arc-shaped grooves 41 incline inward by 3° relative to the upper ends of the groove walls, and the angle between the straight portions at both ends of the U-shaped product 400 and the vertical direction is 3°.

[0064] In this embodiment, since the large arc punch 1 matches the two arc grooves 41, and the upper ends of both sides of the large arc punch 1 are inward, if the two arc grooves are designed as a single groove, the large arc punch 1 cannot enter the groove. Therefore, in this embodiment, the semi-circular groove is divided into two parts. When the large arc punch 1 moves down, the wedge block 3 at the lower end of the bending punch and the two push blocks 4 on the lower die 200 cooperate through the wedge surface, so that the two push blocks 4 approach each other. When the large arc punch 1 moves down to the position, the arc groove 41 between the two push blocks 4 merges into a semi-circular groove, which can realize the inward tilting and bending of the two straight parts of the U-shaped product 400. After the product is demolded, the spring force brought by its own material will make the two straight parts in a 90° vertical state.

[0065] In this embodiment, to avoid damaging the product and to ensure smooth bending, the upper end of the inclined abutment 44 is rounded.

[0066] In this embodiment, the upper mold 100 includes an upper mold base 101, an upper pad 102, an upper clamping plate 103, and a stop plate 104 arranged sequentially from top to bottom. The upper pad 102 and the upper mold base 101 are detachably connected by screws, and the upper clamping plate 103 and the stop plate 104 are detachably connected by screws. Both are slidably engaged with the upper mold base 101 by a nitrogen spring 106. Specifically, the upper end of the nitrogen spring 106 passes through the upper pad 102 and is fixed on the upper mold base 101, while the lower end is fixedly connected to the upper clamping plate 103.

[0067] The upper edge of the large arc punch 1 is connected to a stripper insert 105, which is detachably connected to the stop plate 104 by a headless screw.

[0068] The bending punch 2 is detachably connected to the upper pad 102 by screws.

[0069] To ensure stable up-and-down movement of the bending punch 2, each bending punch 2 is provided with a bending stop 6 on both sides. The outer bending stop 6 is detachably connected to the upper pad 102 by screws, and the inner bending stop 6 passes through the upper pad 102 and is detachably connected to the upper pad 102 by headless screws.

[0070] In this embodiment, a reset spring 5 is connected to the outer side of each of the two push blocks 4, so that when the two push blocks 4 are pushed close to each other by the wedge block 3, the two reset springs 5 ​​store force, and when the two push blocks 4 are not pushed by the wedge block 3, the two reset springs 5 ​​push the two push blocks 4 to reset.

[0071] To ensure stable movement of the push block 4 and facilitate the installation of the return spring 5, a bolt 9 is fitted around the outside of the return spring 5. This bolt 9 passes through the side stop block 8. The return spring 5 is fitted around the bolt 9, with its two ends abutting against the head of the bolt 9 and the side stop block 8, respectively. When the two push blocks 4 approach each other, they drive the bolt 9 to move. The bolt 9 is positioned by the side stop block 8, ensuring stable movement of the push blocks 4. The inward movement of the bolt 9 compresses the return spring 5, allowing it to store force. When the mold opens, the push block 4 is not subjected to pushing force and can quickly return to its original position under the action of the return spring 5, preparing for the next molding operation.

[0072] In this embodiment, a waist-shaped hole 43 is provided through the upper and lower surfaces of the two push blocks 4. The length direction of the waist-shaped hole 43 is the moving direction of the push block 4. A positioning rod 12 for positioning the plate-shaped product is provided in the waist-shaped hole 43. A T-shaped hole 13 is provided on the lower clamping plate 203. The upper end of the T-shaped hole 13 is engaged with the positioning rod 12, and the lower end has a fastening screw 14. The fastening screw 14 is threadedly connected to the lower end of the positioning rod 12, and the head of the fastening screw 14 abuts against the lower surface of the lower clamping plate 203.

[0073] The positioning rod 12 is designed to limit the two ends of the bending direction of the plate-shaped product, ensuring the accuracy of the bending part. When the push block 4 moves, the positioning rod 12 remains stationary, and the push block 4 drives the waist-shaped hole 43 to move.

[0074] In this embodiment, the lower mold 200 includes a lower mold base 201, a lower pad 202, and a lower clamping plate 203 arranged sequentially from bottom to top. The lower pad 202 is detachably connected to the lower mold base 201 by screws, and the lower clamping plate 203 is detachably connected to the lower pad 202 by screws. The two push blocks 4 are slidably disposed on the upper surface of the lower clamping plate 203.

[0075] To prevent the bending punch 2 from impacting and damaging the lower die 200, two lower stops 7 are provided on the upper surface of the lower clamping plate 203. The lower stops 7 are detachably connected to the lower clamping plate 203 by screws, and the two lower stops 7 are located below the two bending punches 2.

[0076] To position and guide the bending punch 2, two side blocks 8 are provided on the upper surface of the lower clamping plate 203. The side blocks 8 are detachably connected to the lower clamping plate 203 by screws. The two side blocks 8 are located on the outside of the two bending punches 2, and the inner side wall of the side blocks 8 is in contact with the outer side wall of the bending punch 2 when the mold is closed.

[0077] In this embodiment, the U-shaped product 400, after being formed, will fit tightly against the semi-circular groove, making it difficult to unload. To facilitate unloading, a float 10 is provided between the two push blocks 4. The upper surface of the float 10 corresponds to and fits the middle of the lower surface of the U-shaped product 400. The lower clamping plate 203 and the lower pad plate 202 corresponding to the lower end of the float 10 have through holes. The float 10 is driven to move upward within the through holes to push the U-shaped product 400 above the semi-circular groove. The float 10 is configured as an inverted T-shape, with its lower end slidingly engaged with the through hole, and its upper end located between the two push blocks 4, moving in and out of the semi-circular groove under the drive. The drive includes a push rod 11, which is driven by a cylinder to push the float 10 upward.

[0078] Once the product is formed, the cylinder can be activated. The cylinder drives the push rod 11 to push the float 10 upward. The upper end of the float 10 pushes the product upward to disengage from the semi-circular groove. After the product is removed, the cylinder drives the push rod 11 downward again, and the float 10 resets under the action of gravity.

[0079] The working process of the above-mentioned one-time molding die is as follows:

[0080] Step 1: Place the plate-shaped product 300 on the upper surface of the two push blocks 4. At this time, the upper surface of the two push blocks 4 serves as a support plane, and the two ends are positioned by the positioning rod 12 protruding to the upper surface of the push blocks 4.

[0081] Step 2: The upper die 100 drives the large arc punch 1 and the two bending punches 2 to move downward, and the large arc punch 1 pushes the plate-shaped product 300 into the space between the two arc-shaped grooves 41.

[0082] As the upper mold 100 moves downward, the two wedge blocks 3 push the two push blocks 4 closer to each other, and the two arc grooves 41 bend the plate-shaped product 300 inward on both sides;

[0083] When the middle of the plate-shaped product 300 reaches the bottom of the groove between the two arc-shaped grooves 41, the straight portion of the plate-shaped product 300 bends upward and tilts inward simultaneously due to the combined action of the inclined abutment part 44 and the inclined support part 15. Figure 3 ;

[0084] Step 3: The upper die 100 moves the large arc punch 1 and the two bending punches 2 upwards. The two return springs 5 ​​move the two push blocks 5 away from each other and reset. The straight section springs back to a 90° vertical position, resulting in the U-shaped product 400. Figure 4 ;

[0085] Step four, while step three is being performed, the cylinder pushes the push rod 11 upward, the push rod 11 pushes the float 10 upward, the float 10 pushes the U-shaped product 400 on it out above the push block 4, and the U-shaped product 400 can be removed.

[0086] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A U-shaped large arc one-time forming mold, used to form a plate-shaped product (300) into a U-shaped product (400), characterized in that: The mold includes an upper mold (100) and a lower mold (200); The lower surface of the upper die (100) has a large arc punch (1) and two bent punches (2) symmetrically arranged on the left and right sides of the large arc punch (1). The lower ends of the opposite surfaces of the two bent punches (2) are detachably connected to wedge blocks (3). The upper surface of the lower mold (200) has two left-right symmetrical push blocks (4). The upper end of the opposite surface of the two push blocks (4) is provided with an arc groove (41). When the two push blocks (4) are close together, the two arc grooves (41) together define a semi-circular groove. A reset spring (5) is connected to the opposite back of the two push blocks (4), and the upper end of the opposite back of the two push blocks (4) is engaged with a wedge block (3) through a wedge surface. When the upper die (100) moves down, the large arc punch (1) pushes the plate-shaped product (300) into the semi-circular groove, and the two wedge blocks (3) push the two push blocks (4) to move closer to each other to form the U-shaped product (400).

2. The U-shaped large arc one-time forming mold according to claim 1, characterized in that: The two arc-shaped grooves (41) extend vertically upward relative to each other and gradually tilt inward to form an inclined abutment (44); the upper end of the head side wall of the large arc punch (1) is provided with an inclined support (15) that cooperates with the inclined abutment (44). The large arc punch (1) matches the semi-circular groove, so that when the plate-shaped product (300) is bent to fit with the semi-circular groove, the straight parts at both ends of the U-shaped product (400) tilt inward and spring back to a 90° vertical state after leaving the semi-circular groove. The inclined abutment (44) and the straight part are inclined inward at the same angle and both are less than 10°; The upper end of the inclined abutment part (44) is rounded.

3. The U-shaped large arc one-time forming mold according to claim 1, characterized in that: The upper mold (100) includes an upper mold base (101), an upper pad (102), an upper clamping plate (103), and a stop plate (104) arranged sequentially from top to bottom. The upper pad (102) and the upper mold base (101) are detachably connected, and the upper clamping plate (103) and the stop plate (104) are detachably connected and the two are slidably engaged with the upper mold base (101) by a nitrogen spring (106); The upper edge of the large arc punch (1) is connected to a stripper insert (105), which is detachably connected to the stop plate (104). The bending punch (2) is detachably connected to the upper pad (102). Each bending punch (2) has a bending stop (6) on both sides, and the bending stop (6) is detachably connected to the upper pad (102).

4. The U-shaped large arc one-time forming mold according to claim 1, characterized in that: The lower mold (200) includes a lower mold base (201), a lower pad (202) and a lower clamping plate (203) arranged sequentially from bottom to top. The lower pad (202) is detachably connected to the lower mold base (201), and the lower clamping plate (203) is detachably connected to the lower pad (202). The two push blocks (4) are slidably disposed on the upper surface of the lower clamping plate (203).

5. The U-shaped large arc one-time forming mold according to claim 4, characterized in that: The upper surface of the lower clamping plate (203) is provided with two lower stops (7) and two side stops (8). The two lower stops (7) are located below the two bending punches (2), and the two side stops (8) are located outside the two bending punches (2). When the mold is closed, the inner sidewall of the side stops (8) is in contact with the outer sidewall of the bending punch (2).

6. The U-shaped large arc one-time forming mold according to claim 5, characterized in that: Each of the two push blocks (4) is connected to a reset spring (5) on its opposite side, so that when the two push blocks (4) are pushed close to each other, the two reset springs (5) store force, and when the two push blocks (4) are not pushed, the two reset springs (5) push the two push blocks (4) to reset; a bolt (9) is sleeved on the outside of the reset spring (5), the bolt (9) passes through the side stop block (8), the reset spring (5) is sleeved on the outside of the bolt (9), and the two ends of the reset spring (5) abut against the head of the bolt (9) and the side stop block (8) respectively.

7. The U-shaped large arc one-time forming mold according to claim 4, characterized in that: A waist-shaped hole (43) is provided through the upper and lower surfaces of the two push blocks (4). The length direction of the waist-shaped hole (43) is the moving direction of the push block (4). A positioning rod (12) for positioning the plate-shaped product (300) is provided in the waist-shaped hole (43). A T-shaped hole (13) is provided on the lower clamping plate (203). The upper end of the T-shaped hole (13) is engaged with the positioning rod (12), and the lower end has a fastening screw (14). The fastening screw (14) is threaded to the lower end of the positioning rod (12), and the head of the fastening screw (14) abuts against the lower surface of the lower clamping plate (203).

8. The U-shaped large arc one-time forming mold according to claim 5, characterized in that: A float (10) is provided between the two push blocks (4). The upper end face of the float (10) corresponds to and fits the middle of the lower surface of the U-shaped product (400). The lower clamping plate (203) and the lower pad plate (202) corresponding to the lower end of the float (10) are provided with through holes. The float (10) is driven to move upward in the through hole to push the U-shaped product (400) above the semi-circular groove.

9. A U-shaped large arc one-time forming mold according to claim 8, characterized in that: The float (10) is configured as an inverted T-shape, with its lower end slidingly engaged with the through hole and its upper end located between the two push blocks (4) and moving in and out of the semi-circular groove under the drive.

10. A U-shaped large arc one-time forming mold according to claim 9, characterized in that: The drive includes a push rod (11), which is driven by a cylinder to push the float (10) upward.

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